The System of Nature

The System of Nature or, the Laws of the Moral and Physical World (Système de la Nature ou Des Loix du Monde Physique et du Monde Moral) is a work of philosophy by Paul-Henri Thiry, Baron d'Holbach (1723–1789). It was originally published under the name of Jean-Baptiste de Mirabaud, a deceased member of the French Academy of Science. D'Holbach wrote and published this book – possibly with the assistance of Diderot[1] but with the support of Jacques-André Naigeon – anonymously in 1770, describing the universe in terms of the principles of philosophical materialism: The mind is identified with brain, there is no "soul" without a living body, the world is governed by strict deterministic laws, free will is an illusion,[2] there are no final causes, and whatever happens takes place because it inexorably must. Most notoriously, the work explicitly denies the existence of God, arguing that belief in a higher being is the product of fear, lack of understanding, and anthropomorphism.

Though not a scientist himself, d'Holbach was scientifically literate and he tried to develop his philosophy in accordance with the known facts of nature and the scientific knowledge of the day, citing, for example, the experiments of John Needham as proof that life could develop autonomously without the intervention of a deity. It makes a critical distinction between mythology as a more or less benign way of bringing law ordered thought on society, nature and their powers to the masses and theology. Theology which, when it separates from mythology raises the power of nature above nature itself and thus alienates the two (i.e. "nature", all that actually exists, from its power, now personified in a being outside nature), is by contrast a pernicious force in human affairs without parallel.[3] Its principles are summed up in a more popular form in d'Holbach's Bon Sens, ou idées naturelles opposees aux idées surnaturelles.[4]

What I like is a philosophy clear, definite, and frank, such as you have in the System of Nature. The author is not an atheist on one page and a deist on another. His philosophy is all of one piece.[6]

P.B. Shelley became an ardent atheist after reading The System of Nature, and proceeded to translate the book into English.[7] According to Will Durant, the System of Nature contains the most comprehensive description of materialism and atheism in the entire history of philosophy.[8]

In his student days, Goethe had recoiled with revulsion at the contents in the book; in his old age he harbored similar views: "We belong to the laws of nature, even when we rebel against them."[9]

According to Voltaire, the book was very popular among the populace, including "scholars, the ignorant, and women."[6]

^System of Nature Vol. 1, Chap XI "Of the System of Man's free agency": "In despite of the gratuitous ideas which man has formed to himself on his pretended free-agency; in defiance of the illusions of this suppose intimate sense, which, contrary to his experience, persuades him that he is master of his will, -- all his institutions are really founded upon necessity: on this, as on a variety of other occasions, practice throws aside speculation."

^System of Nature, Ch. I. Essentially a condensed form of what is also stated by Robert Richardson's preface which he condenses from his translation of Ch. I.